It's not comparable to Kaido because this is not an act. He'll get up once he gathers back his strength, but he needs to gather it back. Saying this is the middle of the fight is like saying Luffy vs Lucci never ended.
It's possible that they fight again when he gets up though, but now there's Saturn taking an active role as the big bad and main menace of the arc, which complicates things.
The “that’s just putting on an act” line was for those trying to pretend like this is something out of the ordinary, not Kizaru’s statement. Anyone who isn’t trolling or beyond saving knows that Kizaru obviously hasn’t shown his best, neither was he knocked out. He’s just momentarily knocked down just as happened with several other characters that weren’t treated the same way by those trying to claim “one shot” or such.
I’m sure I don’t need to point out the differences between Lucci & Kizaru’s cases either.
Saturn is just the excuse used by those trying to make those silly claims because they understand what it means for Luffy to need at least 2 rounds to take out Kizaru for good.
Regardless of whether the fight continues or not, no one with any average sense could even try to pretend that a regular laser beam is the best Kizaru could do.
The desperation to try to call the fight early already says it all.